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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Magnetic Reynolds number ： ウィキペディア英語版 Magnetic Reynolds number The Magnetic Reynolds number (Rm) is a dimensionless group that occurs in magnetohydrodynamics. It gives an estimate of the effects of magnetic advection to magnetic diffusion, and is typically defined by: : $\backslash mathrm\_\backslash mathrm\; =\; \backslash frac$ where * $U$ is a typical velocity scale of the flow * $L$ is a typical length scale of the flow * $\backslash eta$ is the magnetic diffusivity == General Characteristics for Large and Small Rm == For $\backslash mathrm\_\backslash mathrm\; \backslash ll\; 1$, advection is relatively unimportant, and so the magnetic field will tend to relax towards a purely diffusive state, determined by the boundary conditions rather than the flow. For $\backslash mathrm\_\backslash mathrm\; \backslash gg\; 1$, diffusion is relatively unimportant on the length scale ''L''. Flux lines of the magnetic field are then advected with the fluid flow, until such time as gradients are concentrated into regions of short enough length scale that diffusion can balance advection. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Magnetic Reynolds number」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.